BMW 735i Spark Plug Wire Replacement Cost

Know what price you should pay to get your vehicle fixed.

The average cost for a BMW 735i spark plug wire replacement is between $252 and $627. Labor costs are estimated between $88 and $111 while parts are priced between $164 and $516. Estimate does not include taxes and fees.
Note about price: The cost of this service or repair can vary by location, your vehicle's make and model, and even your engine type. Related repairs may also be needed. Talk with a RepairPal Certified shop to learn which repairs might be right for you.

How do spark plug wires work?

The distributor rotor receives the high voltage electricity from the ignition coil wire, and sends it through the distributor through an electrode on the tip of the rotor. As the rotor spins, electrical power is transferred from the rotor to individual electrodes inside the distributor cap. Once that high voltage reaches the distributor cap, the corresponding spark plug wire will carry that high voltage to the spark plug terminal. This action is timed for the moment the cylinder needs the spark plug to fire, and the sequence creates a combustion event inside the engine.

What are the symptoms related to a bad spark plug wire?

A failing ignition wire set will create misfires in the engine, and lead to hesitation, extreme power loss, engine stalling, poor fuel mileage, and illumination of the check engine light. The on-board diagnostics (OBD) trouble codes stored in the vehicle's computer will reflect engine misfires, catalyst inefficiency, and O2 sensor related errors. Under the hood there may be audible arching, that sounds like a rubber band snapping, coming from the ignition coil, distributor, or spark plug ends of any of the spark plug wires. Lastly, the ignition distributor cap and rotor may look burned, wet, corroded, or covered in a powder residue, and the spark plug wires may be cracked or degraded.

Can I drive with a spark plug wire problem?

Ignition system components cause many problems when they fail, normally making the vehicle unpleasant or impossible to drive. Also, the amount of unburned fuel going into the catalyst could cause the catalyst to fail, requiring replacement. With severe ignition problems, the vehicle should be towed to a repair facility.

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How often do spark plug wires need to be replaced?

The ignition wire set is a normal maintenance item, and the replacement schedule is listed in the owner's manual. If the ignition wires, or "spark plug" wires, wear out before the specified mileage, they must be replaced early. When not specified by the manufacturer, the average set of spark plug wires last between 60,000 and 100,000 miles, depending on application and operating environment.

Spark Plug Wire Replacement Cost Estimates

The average cost for a Spark Plug Wire Replacement is between $252 and $627 but can vary from car to car.